This is a very unusual film. It seems that back in the early 1980s, there was a French show in which various directors paid homage to great films by great directors by recreating shortened versions of the films. It's sort of like a 'Reader's Digest' condensation of a movie.
In this first film in the series, the famous French director of suspense films, Claude Chabrol, pays homage to Fritz Lang's "M". Using modern actors but black & white film and appropriate sets, Chabrol created this mini version that seems very much in keeping with the spirit of the original. It's not something that would appeal to most folks, but those who are familiar with "M" and love it, then this is an intriguing sort of film. Oddly, the final scene of Chabrol's homage shows the actual clip of the jury during the final climactic scene from "M". Overall, an interesting experiment.